Eight Democratic attorneys general, including New Jersey Attorney General Gurbir Grewal, filed a lawsuit Monday seeking to block the federal government's settlement with Defense Distributed that makes the plans available online. They also sought a restraining order, arguing the 3D-printed guns would be a safety risk.

Eight Democratic attorneys general, including New Jersey Attorney General Gurbir Grewal, filed a lawsuit Monday seeking to block the federal government's settlement with Defense Distributed that makes the plans available online. They also sought a restraining order, arguing the 3D-printed guns would be a safety risk.

The cause of the collapse is under investigation. Fire officials say that they have ruled out an explosion as a possible cause of the collapse because debris did not explode outward. Officials say that the house “pancaked” down on itself.